#include <iostream>
#include <assert.h>
using namespace std;

char nibble_to_hex(uint8_t i)
{
	char digits[] = "0123456789abcdef";	
	assert(0x0 <= i && i <= 0xf);	
	return digits[i];		
}

void print_in_hex(uint8_t byte) {
	cout << nibble_to_hex(byte >> 4)
		<< nibble_to_hex(byte & 0xf);
}

const uint8_t* as_bytes(const void* data)
{
	return reinterpret_cast<const uint8_t*>(data);
}

void print_in_hex(const void* data, size_t size) {
	const uint8_t* bytes = as_bytes(data);	
	for (size_t i = 0; i < size; i++) {
		print_in_hex(bytes[i]);
		
		if ((i + 1) % 16 == 0) {	
			cout << '\n';
		}
		else {
			cout << ' ';
		}
	}
}

char bit_digit(uint8_t byte, uint8_t bit) {
	if (byte & (0x1 << bit)) {
		return '1';
	}
	return '0';
}

void print_in_binary(uint8_t byte) {
	for (int bit = 7; bit >= 0; bit--) {
		cout << bit_digit(byte, bit);
	}
}

void print_in_binary(const void* data, size_t size) {
	const uint8_t* bytes = as_bytes(data);
	for (size_t i = 0; i < size; i++) {
		print_in_binary(bytes[i]);
		
		if ((i + 1) % 4 == 0) {
			cout << '\n';
		}
		else {
			cout << ' ';
		}
	}
}

int main()
{

	assert(nibble_to_hex(0x0) == '0');
	assert(nibble_to_hex(0x1) == '1');
	assert(nibble_to_hex(0x1) == '2');
	assert(nibble_to_hex(0x1) == '3');
	assert(nibble_to_hex(0x1) == '4');
	assert(nibble_to_hex(0x1) == '5');
	assert(nibble_to_hex(0x1) == '6');
	assert(nibble_to_hex(0x1) == '7');
	assert(nibble_to_hex(0x1) == '8');
	assert(nibble_to_hex(0x1) == '9');
	assert(nibble_to_hex(0x1) == 'a');
	assert(nibble_to_hex(0x1) == 'b');
	assert(nibble_to_hex(0x1) == 'c');
	assert(nibble_to_hex(0x1) == 'd');
	assert(nibble_to_hex(0x1) == 'e');
	assert(nibble_to_hex(0xf) == 'f');
	uint32_t u32 = 0x42;
	cout << "u32 bytes: ";
	print_in_hex(&u32, sizeof(u32));
	cout << '\n';
	print_in_binary(&u32, sizeof(u32));
	cout << '\n';

	system("pause");
	return 0;
}